Improvement in feed-grinding mills



M. S. HARSHA.

Improvement in Feed Grinding MiHs.

No, 124,731 Patented Marchl 1872.

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lMPROVEMENT IN FEED-GRINDING MILLS. I

v Specification forming part of Letters Patent No. 124,737, dated March 19, 1872 antedated February 23, 1872.

SPEGIFIGATION.

which- Figure 1 is a front elevation of a feed-grinding mill embodying my improvements. Fig. 2 is a transverse longitudinal section or plan of the same taken on line .00 w,- and Fig. 3 is an enlarged face view of the grinding-surface detached.

Similar letters of reference indicate corresponding parts in the several figures of the drawing.

My invention relates to the mechanism by which the grinding-surfaces of a feed-mill are secured in proper adjustment, and in the construction of the said grinding-surface, whereby the grain is retained near the center or axis of the same until properly crushed prior to coming in contact with the furrowed portion of the rings; and to that end consists in securing the fixed grinding-surface or ring to a bed-plate, which is attached to the-frame of the machine by a socket-joint, and secured in position by means of bolts passing through the saidplate, and upon which said bolts are affixed rubber springs, whereby the said fixed surface or ring may be readily adjusted to and in position with the rotating grinding-surface of the mill; and alsoconsists in providing the inner portion of the grinding-surface or ring with a series of lugs or projections extending from the inner side of the ring outward to a point near the inner side of the furrowed surface, and which are concaved on the working side inward and backward from the ends in a form which retains the grain near the center or axis of the ring until properly crushed by the contact of the projections therewith.

In the accompanying drawing,"A is the frame-work of the machine, which I usually construct of metal, but may be of wood, or

both wood and metal combined. B is the shaft, carrying the rotating grinding ring G, secured in bearings a a, affixed to the frame of the machine, and which is so arranged as to admit of a slight longitudinal movement, and is firmly secured at the proper adjusted point by a set-screw, b, aflixed to and within bearings a. D is a metal plate, upon which is firmly secured the fixed grinding-surface or ring 0' The said plate is provided at its center with an annular projection, 11, which is loosely fitted within a corresponding recess or socket, cl, formed in the end of the frame A,

the whole of which is so arranged as to admit of a slight rocking movement of the plate. e e and ff are screw-threaded bolts, which are firmly secured within the frame A, and extend outward through plate D. Upon the outer end of each of said bolts I secure a rubber spring, g, arranged between the plate and nut of the bolts, by which spring the said plate and grinding-surface G are secured in proper adjustment and in the required position with the rotating grinding-surface O of the shaft B. F is a metal case, which is loosely afiixed upon the shaft B, and firmly bolted to plate D around the grinding-rings, and which is provided at its lower side with an aperture, through which the grain is discharged after being ground. The outer portion of the grindin g-surface or rings 0 and O are made flat, and are provided with two systems of furrows, t and j. The inner system i is cut or formed in a manner which brings the line of their cuttingedge at or about an angle of forty-five degrees to the line of the diameter of the ring; and the outer system is finely graduated, the cutting-edges being formed in a circle near that of the circumference of the ring, the radius of which circle is arranged at or about an angle of thirty degrees to the line of the inner furrows 42. The inner portions of the rings are beveled to an angle of about fortyfive degrees with the sides, and upon which beveled sur face is arranged a system of lugs or projections, Gr, the front or working sides of which are concaved, forming a'curvature or recess by which the grain is retained near the center or axis of the ring until properly crushed to In operating my machine, the grain to be ground is fed into the hopper A, and forced or conveyed to the grinding-surface of the rings by a screw-threaded collar, B, on shaft B, by the rotation of said shaft.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combination and arrangement, of the runner-ring O, fixed grinding-ring O, adjustable plate D, provided with annular projection d, socket d, and sleeve B, substantially as and for thepurpose described.

The foregoing specification of my invention signed by me this 16th day of March, A. D.

MORTIMER. S. HARSHA. Witnesses N. O. GRIDLEY,. N. H. SHERBURNE. 

